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ASME A17.3-2020 pdf download

ASME A17.3-2020 pdf download.Safety Code for Existing Elevator sand Escalators.
governor pull-through tension (force): the magnitude of the tensile load developed in the moving governor rope after the governor rope retarding means is actuated.
governor rope retarding means: a mechanical means of developing a sufficient force in the governor rope to activate the car or counterweight safeties or to trip the governor rope releasing carrier, where used. Such mechanical means include, but are not limited to, rope-gripping jaws, clutch mechanisms, and traction arrangements.
hail lantern: an audible and visual signaling device located at a hoistway entrance to indicate which car is answering the call and the car’s intended direction of travel.
handrail stand: the uppermost portion of the balustrade that supports and guides the handrail.
hoistway (shaft), elevator, dumbwaiter, or material lift: an opening through a building or structure for the travel of elevators, durnbwaiters, or material lifts, extending from the pit floor to the roof or floor above.
hoistway, blind: the portion of a hoistway where hoistway entrances are not provided.
hoistway, multiple: a hoistway with more than one elevator, dumbwaiter, or material lift.
hoistway, single: a hoistway with a single elevator, dumbwaiter, or material lift.
hoistway, mine: the area within a mine shaft and its above ground structure required for the elevator equipment, associated supports, and operations, including a minimum of 450 mm (18 in.) around same.
hoistway access switch: a switch, located at a landing, the function of which is to permit operation of the car with the hoistway door at this landing and the car door or gate open, in order to permit access to the top of the car or to the pit.
hoistway door: see door.
hoistway door electric contact: see door or gate electric contact.
hoistwaydoororgate locking device: a device that secures a hoistway door or gate in the closed position and prevents it from being opened from the landing side except under certain specified conditions.
hoistway door combination mechanical lock and electric contact: a combination mechanical and electrical device with two related, but entirely independent functions, which are
(a) to prevent operation of the driving machine by the normal operating device unless the hoistway door is in the closed position
(b) to lock the hoistway door in the closed position and prevent it from being opened from the landing side unless the car is within the landing zone
NOTE: As there is no positive mechanical connection between the electric contact and the door locking mechanism, this device ensures only that the door will be closed, but not necessarily locked, when the car leaves the landing. Should the lock mechanism fail to operate as intended when released by a stationary or retiring car-cam device, the door can be opened from the landing side even though the car is not at the landing. If operated by a stationary car-cam device, it does not prevent opening the door from the landing side as the car passes the floor.
hoistway door interlock: a device having two related and interdependent functions, which are
(a) to prevent the operation of the driving machine by the normal operating device unless the hoistway door is locked in the closed position
(b) to prevent the opening of the hoistway door from the landing side unless the car is within the landing zone and is either stopped or being stopped
hoistway door interlock retiring cam device: a device that consists of a retractable cam and its actuating mechanism and that is entirely independent of the car door or hoistway door power operator.
hoistway gate separate mechanical lock: a mechanical device the function of which is to lock a hoistway gate in the closed position after the car leaves a landing and prevent the gate from being opened from the landing side unless the car is within the landing zone.
hoistway enclosure: the fixed structure, consisting of vertical walls or partitions, that isolates the hoistway from all other areas or from an adjacent hoistway and in which entrances are installed.
hoistway gate: usually a counterweighted (counterbalanced) assembly, consisting of one or more sections that are guided in the vertical direction to open or close. The gate may be of wood or metal construction. Wood gates may consist of either horizontal or vertical slats. Metal gates are usually constructed of perforated or expanded metal.

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